Gate-valve.



F. W. HUDSON.

GATE VALVE.

APPLICATION FILED SEPT. 18. 1912.

Patented Nov. 9, 1915.

2 SAHEETS'SHEET 1.

INVENTflR FRANK W H1111: obr

WITAES/SES ATTORNEY.

cuLuMalA PLANPORAPH coqwvumuomm 11 F. W. HUDSON.

GATE VALVE.

APPLICATION FILED SEPT. 18. 1912 Patented Nov. 9, 1915.

2 SHEET SSHEET 2.

IN VEN TOR 73mm: W. Hmso/v.

I ATTORNEY:

VWTNESSES V wedge and gates and the shape ofthepas- UNITED STATES PATENTOFFICE.

FRANK W. HUDSON, OF SHARON, PENNSYLVANIA, ASS-IGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO HORACE VI. DAVIS, 0F SHARON, PENNSYLVANIA.

GATE-VALVE.

Application filed September 18, 1912.

T0 aZZ whom it may concern:

Be it known thatI, FRANK W. HUDSON, citizen of the United States,residing at Sharon, in the county of Mercer and State of Pennsylvania,have invented certain new and useful Improvements in Gate-Valves, ofwhich the following is a specification.

This invention relates to valves of the type known as gate valves.

One of the objects of my invention is the provision of such a valve withseats which, while the valve is open, are protected from the action ofthe fluid passing through the valve.

Another object is to obtain a valve of this type which, when opened,affords a smooth rectangular passage'without recesses whereby the valvecannot be clogged with dirt or other foreign matter carried by the fluidpassing through it.

A still further object lies in accomplishing the foregoing ends, and atthe same time providing a valve of comparatively few parts and of simpleconstruction and which combines with a low cost of manufacture a minimumof operating parts.

Still further objects and purposes of'my invention will appear from aninspection of the drawings, theispecification describing the same, andthe claims appended thereto in which are set forth the combination ofelements, arrangement of parts and novel structural details properlycomprised within the scope of the same.

In the drawings, in which is illustrated one of the possible embodimentsof my invention, Figure l is a side cross sectional elevation of my gatevalve, when closed, showing the lower seat protector depressed, the cageabutting thereon, and the side gates expanded against the seats. Fig. 2.is a front sectional elevation of the gate cage. Fig. 3is a side view ofthe gate cage. Fig. 4 is an end view of the wedge. Fig; 5 is a frontview of the same member. Figs. 6

' and 7 are rear and side views respectively of a gate member. Fig. 8 isan end view of the bottom seat protector'showing the slottherein. Fig. 91s a reduced diagrammatic view and side elevation of the valve body,

showing in outline the position of the cage,

sage when the valve is opened.

Referring now to the several figures 1n which like reference charactersdes gnate Specification of Letters Batcnt.

Patented Nov. 9, 1915,

Serial No. 721,066.

which affords a seat for the spiral spring (7), which'when the valve isopened raises the protector (6') to its normal position. This seatprotector .(6) as seen by inspection of Figs. 1 and 8, is rectangular inform and provided. with the slot (6) at one side, into which the seatstop 6 projects, thereby limiting the vertical movement of the-protector(6). The valve bonnet (9) rests upon a packing (9) and is secured to thevalve body by bolts or other suitable means (9).

Threaded into the upper end of this is the stuffing box (10) and thereinthe packing (11), held in place by the gland (12) and surrounded by thegland nut" (13).

The valve, which in the present-formis A that of the non-risingstemvariety is provided with the stem- (14) and acollar (15) mountedfor'rotative movement between the stufiing boX- (10) and bonnet (9)..The upper part of the stem is provided with a hand wheel (16). Belowthe collar, the stem is threadedas at 17, this thread having-engagementwith the female threaded upper portion (18) of the gate cage- (19). Asis niore clearly shown in -FigsQ and 3, this gate cage, whichis anintegral casting, comprises the top (20) recessed in front and rear at20. Extending down on either side are legs (21) connecting the top withthe bottom member (22). The bottom member tension, theinnersidesof-which, together with the bottom of the member, (22-), comisprovi'dedon either side with a'later'al eX- prise three sides'of the rectangularfluid-- passage. The wedge (24k) as -more clearly shown in Figs. 4 and5, has its sides sloping outwardly toward the bottom and at the top isprovided "with outwardly extending flanges These flanges are adapted-tocontact withthe shoulders (25) and the valvebody proper when the valveis'closed, thereby preventing further downwardinovement of the wedge.

The upper and lower seats for the gate are designated by the characters(1) and (1"). The gates (26) as shown more clearly in Figs. 6 and 7comprise two members having their outer surfaces parti-cylindrical inshape. The inner part of each gate is downwardly tapering in form, thegates being inclined at the same angle as that of the sides of thewedge. As appears in 1, these gates, Which. are carried by the cage,have a limited vertical movement within the cage as does also the wedgeIn use, my valve operates as follows: Starting with it in open positionin which a smooth, rectangular passage is presented, as shown in Fig. 9,the hand wheel is turned in a clock wise direction, the stem being thereby rotated. The cage is then pressed downwardly, carrying with it thehollow wedge and gate members. \Vhen. the bottom of the cage abutsagainst the bottom seat protector, it is moved downwardly against thetension of the spring (7) until stopped by the stop (6). At the sametime the wedge flanges (25) have come in contact with the shoulders (25)and are prevented from further downward movement while the continuedrotation of the stem forces downwardly the cage, carrying with it thegates whichhave at this time closed the fluid passage. When the flanges(25) abut against the shoulders (25) the tapered surface of the wedgeacting upon the reverse tapering of the gates, separating them, thuslocking them against the seats 1) and (1) In reversing the rotation. ofthe hand wheel, the valve is again opened, the operation of the partsreversing. The cage first moves upwardly and the wedge flanges (25)remain against the shoulders (25) until the under part of the flangesrests on the upper portion of the gate inembers- The gates are thusallowed to move slightly inwardly, thus loosening the contact betweenthe gates and the seat. The cage continues upwardly carrying with it thewedge andgates, while the seat protector (6) relieved of the pressure ofthe gate bottom moves until limited by the stop (6) so that the top ofthe protector (6) is flush with the seats (1). When the cage has reachedits maximum height, the gates are above the upper seats seats againstwhich the gates lock is, while the valve is opened, protected by thecage and lower seat protector.

I have found it desirable to embody the general idea in this valve invalves of other specific design. In a valve known as the flat type, arectangular cage may be employed. In such a type the same principle isapplied by using fiat gates having projections on their inner sidesagainst which a short vbar, the equivalent of the present wedge, passingthrough the sides of the gate,

abuts against suitable shoulders and the projections coming down uponthe bar in like manner spread apart the gate. In the latter form, aswell as other adaptations, I employ the lateral extensions of the cagewhich,

cooperating with the lower seat protector,

afiord an unobstructed. flue or passage and. sure protection to the gateseats.

I claim 1. A gate valve having in combination a cage, gates carried bysaid cage, a movable seat protector in the bottom of the valve, andlateral extensions on said cage extending below said seat protector.

2. A gate valve having in combination a cage, gates carried by saidcage, a seat .pro tector, said cage and seat protector havinglongitudinal movement within the valve, said. seat protector beingdepressed by contact of the bottom of the cage with it, and lateralextensions onsaid cage extending below the top of said seatprotector inany position of the cage.

3. A gate valve having in combination a cage mounted for longitudinalmovement therein, a seat protector having limited longitudinal movementin the bottom of said valve, lateral members extending downwardly fromthe bottom. of said. cage to a pointbelow the top of the seat protectorin any position of the cage, the inner surfaces of said members beingparallel and flush with the inlet passage of the valve, and gatescarried by the cage and adapted, when the latter travels in onedirection, to move up- 'Wardly and close the valve.

l. In a gate valve, a seat protector having a flat top, a closingmember, having gates thereon, having its bottom parallel with said topand parallel lateral extensions eX- tending from said closing member toa point below the top of theprotector.

5. A gate valve having metal seats, aseat protector, closing membersmovably mounted therein, lateral extensions extending from theclosingmember to a point below the protector, the top of said protector,bottom. of said closing member and adjacent sides of said extensionspresenting a flat surfaced I rectangular fluid passage in any openadjustment of the valve, a means whereby the closing members are lockedagainst the metal seats.

6. In a gate valve, the combination of a valve body, seats therein,shoulders above the seats, a cage having longitudinal movement withinthe valve, gates carried by the cage and means having limited movementwithin said cage and adapted, upon coming in contact with the shoulders,to press said gates against the seats.

7.. A gate valve having in combination a movable bottom seat protector,a movable cage cooperating therewith to depress it, gates carried bysaid cage and a member having a limited movement within the cage andadapted to move up relatively to the cage and spread the gates as theprotector i depressed.

8. A gate valve having a plurality of seats therein, expanding gates,and movable members registering flush with each of said seats when thevalve is opened.

9. A gate valve having rectangular seats therein, gates coacting withsaid seats to close the valve, and members moving into a flush positionwith the whole of said seats when the valve is opened.

10. A gate valve having seats therein, a cage, gates carried by saidcage, and members adapted to move upwardly with said cage and contactwith that portion of each seat vacated by the cage.

FRANK W. HUDSON.

Witnesses:

FRED T. FRUIT, EUGENE E. ANDERSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

